Hinge pin



FIG. 1 is a perspective view of a hinge pin embodying my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a side view taken from the right of FIG. 1;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a second embodiment of the design of FIG. 1, the only difference being the reversal of the curve of the shoulder. 

The ornamental design for a hinge pin, as shown and described. 